Microbial resistant roof coating and system

ABSTRACT

A roofing and/or siding material that reduces the incidence of undesired micro-organisms from entering into the air intake of air conditioner and/or heating systems of a building structure to thereby improve the quality of the air in the building structure.

The present invention is a divisional application of U.S. patentapplication Ser. No. 14/044,309 filed Oct. 2, 2013, which in turn claimspriority on U.S. Provisional Patent Application Ser. No. 61/711,501filed Oct. 9, 2012, which is incorporated herein.

The present invention is directed to building structures that resist orinhibit microbial growth, particularly to roofing and/or siding systemsthat are formed of and/or are coated with components that resist orinhibit microbial growth, and more particularly to a roofing and/orsiding system that includes one or more coating materials that resist orinhibit microbial growth and a method for forming such roofing and/orsiding system and method for maintaining the efficacy of the roofingand/or siding system to resist or inhibit microbial growth.

BACKGROUND OF THE INVENTION

Mold and mildew are commonly associated with sickness, rashes andrespiratory problems, among others. The contamination of a publicfacility with various types of mold and mildew can result in mild orsevere health problems for one or more individuals located in suchpublic facilities. One source of mold and mildew that is commonlyoverlooked is mold and mildew that grows and accumulates on the outsideof a building structure. Such mold and mildew can subsequently be drawninto the air conditioning and/or heating system of the building throughone or more air intake ducts that are commonly located on the roof of abuilding. Once the mold and mildew is drawn into the air intake of theair conditioning and/or heating system, any mold or mildew not collectedby the filtration system is then spread throughout the interior of thebuilding by the air conditioning and/or heating system.

Certain types of facilities, such as hospitals, can utilize a complexand expensive air filtration system to remove foreign material from theair circulated by the air conditioning and/or heating system. However,most public facilities such as indoor malls, schools, libraries,government buildings, office buildings, manufacturing plants, etc. donot use these complex and expensive air filtration systems. Generally, astandard air filter is used to remove larger particles from the air.However, these standard filters advertise prevention of over 99% of themold and mildew from passing freely into the building space.

Standard roof systems, whether single ply, MB, BUR, asphalt shingledsystem, wood shingled system, concrete roofing system, metal roofingsystem, etc. do not resist or inhibit microbial growth on the roofingsystem. As such, over time, mold and mildew grow on the roofing systemand can contaminate the air that is drawn into the air intake(s) of theair conditioning and/or heating system of a building.

In view of the current state of the art of roofing and/or sidingsystems, there is a need for a roofing and/or siding system and methodfor maintaining a roofing and/or siding system that resists or inhibitsmicrobial growth on the roofing and/or siding system.

SUMMARY OF THE INVENTION

The present invention is directed to a roofing and/or siding system thatincludes a coating material that resists or inhibits microbial growthand method for forming such roofing and/or siding system and method formaintaining the efficacy of the roofing and/or siding system to resistor inhibit microbial growth. Although the invention will be particularlydescribed with reference to a roofing and/or siding system, it will beunderstood that the invention has broader applications and can be usedon other structures (e.g., plaza decks, exterior and interior walls,floors, sidewalks, patios, decks, stairs, steps, porches, etc.). Theinclusion of one or more agents that inhibit or prevent microbial growthon and/or in the roofing and/or siding material can be used to preventor inhibit the growth of fungus, mold, mildew and/or other types ofundesirable micro-organisms on the roofing and/or siding material,thereby reducing the incidence of undesired micro-organisms being drawninto the air intake of air conditioner and/or heating units on the roofor other locations of a building. As such, the present invention isdirected to a roofing and/or siding system that can improve the airquality for individuals located inside a building structure without theneed for expensive and complex air filtration systems.

In one non-limiting aspect of the present invention, there is provided amaterial that can be used in a roofing and/or siding material thatincludes one or more agents that inhibit or prevent microbial growth onthe roofing and/or siding material. The one or more agents that inhibitor prevent microbial growth can be added to the roofing and/or sidingmaterial when the roofing and/or siding material is being preformedand/or added to the roofing and/or siding material at the time theroofing and/or siding material is being formed or applied to a buildingstructure.

In another and/or alternative non-limiting embodiment of the presentinvention, the one or more agents that inhibit or prevent microbialgrowth are coated on all or a portion of the outer surface of theroofing and/or siding material. The coating can be applied after theroofing and/or siding material has been preformed, and/or during and/orafter the roofing and/or siding material has been applied to a buildingstructure. The coating can be designed to be spray coated, painted,mop-applied, and the like. The coating can be a clear coating or includea color pigment to form a colored coating. The thickness of the coatingon the roofing and/or siding material is non-limiting.

In still another and/or alternative non-limiting embodiment of theinvention, there is provided a method for improving the air quality ofair that is circulated in a building structure without the need forexpensive and complex air filtration systems. The method includes thesteps of installing a roofing and/or siding material on a buildingstructure that is located near or adjacent to an air intake of an airconditioner and/or heating unit, and wherein the roofing and/or sidingmaterial includes and/or is coated with one or more agents that inhibitor prevent microbial growth on and/or in the roofing and/or sidingmaterial, thereby reducing the incidence of undesired micro-organismsbeing drawn into the air intake of the air conditioner and/or heatingunit. The method can also optionally include the step of having amajority or all of the roofing and/or siding material that is installedon the building include and/or be coated with one or more agents thatinhibit or prevent microbial growth on and/or in the roofing and/orsiding material. The method can also optionally include the step ofcoating the roofing and/or siding material with a clear or coloredcoating that includes one or more agents that inhibit or preventmicrobial growth during or after the roofing and/or siding material isinstalled on the building. The method can also optionally include thestep of applying a coating that includes one or more agents that inhibitor prevent microbial growth to a portion or all of the air intakeduct(s) of the air conditioner and/or heating unit.

The method can also optionally include the step of reapplying a coatingon the roofing and/or siding material, which coating includes one ormore agents that inhibit or prevent microbial growth, after a certaintime period so as to maintain the efficacy of the coated roofing and/orsiding material to inhibit or prevent microbial growth on the roofingand/or siding material. The method can also optionally include the stepof reapplying a coating on a portion or all of the air intake duct(s) ofthe air conditioner and/or heating unit, which coating includes one ormore agents that inhibit or prevent microbial growth, after a certaintime period so as to maintain the efficacy of the coated air intake ductto inhibit or prevent microbial growth on the air intake duct. Themethod can also optionally include the step of inspecting the quality ofthe roofing and/or siding material that is installed on the buildingafter a certain period of time to determine if repairs are requiredand/or if another coating layer, which coating includes one or moreagents that inhibit or prevent microbial growth, should be applied tothe roofing and/or siding material and/or air intake duct so as tomaintain the efficacy of the coated roofing and/or siding materialand/or air intake duct to inhibit or prevent microbial growth on theroofing and/or siding material and/or air intake duct.

In yet another and/or alternative non-limiting aspect of the presentinvention, there is provided a coating material that includes one ormore agents that inhibit or prevent microbial growth that is formulatedso that the coating material can be coated on a variety of substratesthat include, but are not limited to, mineral cap sheet, flood coatedrock, aluminum, Galvalume™, galvanized, Kynar™, steel, EPDM, PVC, TPO,coal tar mineral, white reflective elastomeric coating, and whitereflective polyurethane coating.

In still yet another and/or alternative non-limiting aspect of thepresent invention, there is provided a coating material that is a clearcoating.

In another and/or alternative non-limiting aspect of the presentinvention, there is provided a coating material that is a coloredcoating that includes some pigment (e.g., 0.1-5%, typically 0.2-0.8%).One non-limiting pigment can include titanium dioxide. The pigment inthe coating material, when optionally used, can 1) provide theapplicator some idea where the coating was applied (especially useful ona gray or darker surface) and/or 2) TiO₂ has been shown to impart UVstability when used in coatings, so once applied, the coating materialwould have some protection against UV degradation.

In another and/or alternative non-limiting aspect of the presentinvention, there is provided a coating material that includes a basecoat composition and one or more anti-microbial additives. The base coatcomposition can include one or more resins. The one or more resins caninclude, but are not limited to, resins of acrylate, vinyl, styrene,vinyl acetate, ester and urethane polymers. In one non-limitingembodiment of the invention, the resin includes a water-based acrylicresin with a glass transition temperature (T_(g)) of about −5° F. to 20°F., typically about 0° F. to 10° F., and more typically about 3° F. to7° F. The one or more anti-microbial additives can include, but are notlimited to, methyl 2-benzimidazolecarbamate (BCM), 3-Iodo-2propynylbutyl carbamate (IPBC), and/or 3-(3,4-dichlorphenyl)-1,1-dimethylurea.The one or more anti-microbial additives can also or alternativelyinclude one or more naturally occurring and/or synthetic proteins,polypeptides and/or peptides as a means to inhibit fungal and bacterialgrowth. Such naturally occurring and/or synthetic proteins, polypeptidesand/or peptides can be used to target specific fungal species orbacterial species that are present on roof and/or siding surfaces;however, this is not required. Other non-limiting examples ofanti-microbial additives that can also or alternative be used, aredisclosed in U.S. Pat. No. 8,106,111; U.S. Pat. No. 7,939,500; U.S. Pat.No. 7,932,230; U.S. Pat. No. 7,736,423; US 2005/0058689; US2006/0141003; US 2012/0097194; EP 0355765 and EP 2431429, all of whichare incorporated herein by reference. The coating material can alsooptionally include a coloring agent that becomes clear or substantiallyclear once the coating dries and/or cures. The coloring agent can alsobe formulated to cause the dried and/or cured coating to be glossyand/or semi-glossy; however, this is not required. Non-limiting examplesof such a color agent includes, but is not limited to, a pH indicator(e.g., phenol red, phenolphthalein, thiolphthalein, etc.).

In still another and/or alternative non-limiting aspect of the presentinvention, there is provided a clear coating material that includes abase coat composition and one or more anti-microbial additives. The basecoat composition can include one or more resins. The one or more resinscan include, but are not limited to, acrylate, vinyl, styrene, vinylacetate, ester and/or urethane polymers. In one non-limiting embodimentof the invention, the resin includes an acrylic resin (e.g., awater-based acrylic resin) with a glass transition temperature (T_(g))of about 0° F. to 90° F., typically 5° F. to 80° F., and more typicallyabout 65-78° F. In one non-limiting formulation, the resin is 100%acrylic resin (e.g., Dow's EI-6000) that has a glass transitiontemperature (T_(g)) of about 72° F. to 78° F. The one or moreanti-microbial additives can include, but are not limited to,dichloro-2-n-octyl-4-isothiazolin-3-one, sodium copperethylenediaminetetraacetate, methyl 2-benzimidazolecarbamate (BCM),3-iodo-2propynyl butyl carbamate (IPBC), and/or3-(3,4-dichlorphenyl)-1,1-dimethylurea. The one or more anti-microbialadditives can also or alternatively include one or more naturallyoccurring and/or synthetic proteins, polypeptides and/or peptides as ameans to inhibit fungal and bacterial growth. Such naturally occurringand/or synthetic proteins, polypeptides and/or peptides can be used totarget specific fungal species or bacterial species that are present onroof and/or siding surfaces; however, this is not required. Othernon-limiting examples of anti-microbial additives that can also oralternative be used, are disclosed in U.S. Pat. No. 8,106,111; U.S. Pat.No. 7,939,500; U.S. Pat. No. 7,932,230; U.S. Pat. No. 7,736,423; US2005/0058689; US 2006/0141003; US 2012/0097194; EP 0355765 and EP2431429, all of which are incorporated herein by reference. The coatingmaterial can also optionally include a coloring agent that becomes clearor substantially clear once the coating dries and/or cures. The coloringagent can also be formulated to cause the dried and/or cured coating tobe glossy and/or semi-glossy; however, this is not required.Non-limiting examples of such a color agent includes, but is not limitedto, a pH indicator (e.g., phenol red, phenolphthalein, thiolphthalein,etc.).

In still yet another and/or alternative non-limiting aspect of thepresent invention, there is provided a base coat composition materialthat can optionally be applied to a roofing and/or siding material priorto the application of the clear coating in accordance with the presentinvention.

In another and/or alternative non-limiting aspect of the presentinvention, there is provided a method for applying a coating material(e.g., clear coating, non-clear coating) to a roofing and/or sidingmaterial that inhibits or prevents microbial growth on the roofingand/or siding material comprising the steps of:

a. Cleaning the surface of the roofing and/or siding material which isinstalled on a building structure, wherein the washing process canoptionally including a power washing process with a detergent (e.g.,Simple Green®), diluted bleach solution, etc., and then optionally arinsing cleaning;

b. Optionally applying one or more coatings of a bio-resistant base coatcomposition to the roofing and/or siding material (e.g., spray coating,brush coating, etc.);

c. Applying one or more coatings of a bio-resistant clear or non-clearcoating (e.g., spray coating, brush coating, etc.) that would retain itsanti-microbial properties for a period of 3-36 months and typicallyabout 12-24 months; and,

d. Optionally applying a new a coating of a bio-resistant clear ornon-clear coating after a certain period of time has passed (e.g. 3-36months) since applying a previous coating of a bio-resistant clear ornon-clear coating so as to maintain the efficacy of the coating on theroofing and/or siding material.

One non-limiting object of the present invention is to provide a coatedroofing and/or siding material that reduces the incidence of undesiredmicro-organisms from entering into the air intake of air conditionerand/or heating systems of a building structure to thereby improve thequality of the air in the building structure.

Another non-limiting object of the present invention is to provide acoated roofing and/or siding material that includes and/or is coatedwith one or more agents that inhibit or prevent microbial growth on theroofing and/or siding material.

Still another and/or alternative non-limiting object of the presentinvention is to provide a clear or colored coating that includes one ormore agents that inhibit or prevent microbial growth on the coatedsurface, and which coating can be applied onto a roofing and/or sidingmaterial.

Yet another and/or alternative non-limiting object of the presentinvention is to provide a clear or colored coating that includes one ormore agents that inhibit or prevent microbial growth, and which coatingcan be spray painted onto a roofing and/or siding material.

Still yet another and/or alternative non-limiting object of the presentinvention is to provide a clear or colored coating that includes one ormore agents that inhibit or prevent microbial growth and resist UVdegradation, and which coating can be applied onto a roofing and/orsiding material.

Another and/or alternative non-limiting object of the present inventionis to provide a method for applying a clear or colored coating thatincludes one or more agents that inhibit or prevent microbial growthand/or resist UV degradation, and which coating can be applied onto aroofing and/or siding material.

Still another and/or alternative non-limiting object of the presentinvention is to apply a base coat composition to a roofing material thatincludes one or more agents that inhibit or prevent microbial growthand/or resists UV degradation, and then applying a clear coating on thebase coat composition, which clear coating includes one or more agentsthat inhibit or prevent microbial growth and/or resist UV degradation.

Still yet another and/or alternative non-limiting object of the presentinvention is to provide a method for applying a clear or colored coatingthat includes one or more agents that inhibit or prevent microbialgrowth and/or resist UV degradation, and which coating can be appliedonto a roofing and/or siding material, and subsequently maintaining theefficacy of the coating to inhibit or prevent microbial growth and/or toresist UV degradation.

These and other objects and advantages will become apparent to thoseskilled in the art upon reading and following the description takentogether with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

Reference may now be made to the drawings which illustrate variousnon-limiting embodiments that the invention may take in physical formand in certain parts and arrangement of parts wherein:

FIG. 1 is a graph illustrating bacterial growth on treated and untreatedsurfaces; and,

FIG. 2 is a graph illustrating fungal growth on treated and untreatedsurfaces.

DETAILED DESCRIPTION OF THE NON-LIMITING EMBODIMENTS

Referring now to the drawings, wherein the showings are for the purposeof illustrating preferred embodiments of the invention only and not forthe purpose of limiting same, the present invention is directed to aroofing and/or siding system or other building structure (e.g., plazadecks, exterior and interior walls, floors, sidewalks, patios, decks,stairs, steps, porches, etc.) that includes a coating material that isformulated to resist or inhibit microbial growth (e.g., bacteria,fungus, etc.) and method for forming such roofing and/or siding systemand method for maintaining the efficacy of the roofing and/or sidingsystem to resist or inhibit microbial growth. The inclusion of one ormore agents that inhibit or prevent microbial growth can be used toprevent or inhibit the growth of fungus, mold, mildew and/or other typesof undesirable micro-organisms on the roofing and/or siding material orother building structures, thereby reducing the incidence of undesiredmicro-organisms from contacting individuals and/or from being drawn intothe air intake of air conditioner and/or heating units on the roof orother locations of a building. As such, the present invention isparticularly directed to a roofing and/or siding system that can improvethe air quality for individuals located inside a building structurewithout the need for expensive and complex air filtration systems.

The one or more agents that inhibit or prevent microbial growth aretypically coated on all or a portion of the outer surface of the roofingand/or siding material or other building structures. The coating can beapplied after the roofing and/or siding material has been preformed,and/or during and/or after the roofing and/or siding material has beenapplied to a building structure. The coating can be designed to be spraycoated, painted, mop-applied, and the like. The coating can be a clearcoating or include a color pigment to form a colored coating.

The coating material that includes one or more agents that inhibit orprevent microbial growth can be coated on a variety of substrates thatinclude, but are not limited to, mineral cap sheet, flood coated rock,aluminum, Galvalume™, galvanized, Kynar™, steel, EPDM, PVC, TPO, coaltar mineral, white reflective elastomeric coating, and white reflectivepolyurethane coating.

The coating material includes a base coat composition and one or moreanti-microbial additives. The base coat composition can include one ormore resins. The one or more resins can include, but are not limited to,resins of acrylate, resins of latex, vinyl, styrene, vinyl acetate,ester and/or urethane polymers. In one non-limiting embodiment of theinvention, the resin includes a water-based acrylic resin with a glasstransition temperature (T_(g)) of about −5° F. to 20° F., typicallyabout 0° F. to 10° F., and more typically about 3° F. to 7° F. Onenon-limiting resin that can be used is an acrylic latex resin (e.g.,Rhoplex EI-6000 from Dow Chemical, etc.). Other resins that can be usedinclude, but are not limited to, Elastine 8556™, Lipacryl MB3640™,Primal 8349™, Primal AC-3001™, Primal AS-8000™, Primal EC-1791™, PrimalMC-76LO™, Primal WL8179™, UCAR 161N™, UCAR CM 101™; RHOPLEX™ EI-2000 andRHOPLEX™ EI-5000. The one or more anti-microbial additives can include,but are not limited to, 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one,sodium copper ethylenediaminetetraacetate, methyl2-benzimidazolecarbamate (BCM); 3-Iodo-2propynyl butyl carbamate (IPBC);3-(3,4-dichlorphenyl)-1,1-dimethylurea;1,3-dihydroxymethyl-5,5-dimethylhydantoin;1-hydroxymethyl-5,5-dimethylhydantoin; methyl 2-benzimidazolecarbamate;3-Iodo-2-propynyl butyl carbamate;diuron[3-(3,4-dichlorphenyl)-1,1-dimethylurea);Cyclopropyl-N′-(1,1-dimethylethyl)-6-(methylthio)-1,3,5-triazine-2,4-diamine;octylisothiazolone; and quaternary ammonium compound. Non-limitingexamples of commercially available anti-microbial additives that can beused include Bioban 200 and Rozone 2000™(4,5-dichloro-2-n-octyl-4-isothiazolin-3-one and sodium copperethylenediaminetetraacetate), Polyphase 662™ (Methyl2-benzimidazolecarbamate, 3-Iodo-2-propynyl butyl carbamate andcyclopropyl-N′-(1,1-dimethylethyl)-6-(methylthio)-1,3,5-triazine-2,4-diamine);Polyphase 663™ (Methyl 2-benzimidazolecarbamate, 3-Iodo-2-propynyl butylcarbamate and Diuron[3-(3,4-dichlorphenyl)-1,1-dimethylurea)); Troysan395™ (1,3-dihydroxymethyl-5,5-dimethylhydantoin and1-hydroxymethyl-5,5-dimethylhydantoin); Bioban 100™ (octylisothiazolone;and quaternary ammonium compound). The one or more anti-microbialadditives can also or alternatively include one or more naturallyoccurring and/or synthetic proteins, polypeptides and/or peptides as ameans to inhibit fungal and bacterial growth. Such naturally occurringand/or synthetic proteins, polypeptides and/or peptides can be used totarget specific fungal species or bacterial species that are presentroof and/or siding surfaces; however, this is not required. Othernon-limiting examples of anti-microbial additives that can also oralternative be used, are disclosed in U.S. Pat. No. 8,106,111; U.S. Pat.No. 7,939,500; U.S. Pat. No. 7,932,230; U.S. Pat. No. 7,736,423; US2005/0058689; US 2006/0141003; US 2012/0097194; EP 0355765 and EP2431429, all of which are incorporated herein by reference. The coatingmaterial can also optionally include a coloring agent that becomes clearor substantially clear once the coating dries and/or cures. The coloringagent can also be formulated to cause the dried and/or cured coating tobe glossy and/or semi-glossy; however, this is not required.Non-limiting examples of such a color agent includes, but is not limitedto, a pH indicator (e.g., phenol red, phenolphthalein, thiolphthalein,etc.). The coating material can include one or more dispersants orsurfactants, coalescing solvent, defoamers, and/or deairators.Non-limiting surfactants that can be used include ethoxylated nonionicsurfactant (e.g., Carbowet 106™ (air products), Carbowet 109™ (airproducts), Carbowet 125™ (air products), Carbowet 138™ (air products),etc.); benzyl-polyethylene glycol (1,1,3,3-tetramethylbutylphenyl)ether, benzyl-polyethylene glycol tert-octylphenyl ether (e.g., Triton™CF-10 (Dow Chemical), etc.). The coating material can include one ormore defoamers. Non-limiting defoamers include 3-dimensional siloxane(e.g., DEEFO PI-35™ (Munzing), DEEFO PI50™ (Munzing), etc.); emulsion ofpolyether-siloxane (e.g., Tego Airex 902W™ (Evonik), etc.). The coatingmaterial can include one or more coalescing solvents (e.g., non-watersolvents). Non-limiting coalescing solvents include ester alcohol (e.g.,Texanol™ (Eastman Chemical), etc.). The coating material can include oneor more deairators. Non-limiting coalescing deairators include siloxanedeairator (e.g., Airase 8070™ (Air Products), etc.). The coatingmaterial can include one or more additional materials such as pHindicators, fillers, color pigments (e.g., titanium dioxide, etc.) andthe like.

One general formulation of the coating is as follows:

Raw Material Weight % Range Water 10-40 Resin 20-75 Anti-microbialAdditive 0.01-10  pH Indicator 0-1 Dispersant or surfactant 0-2 Defoamer0-2 pH adjuster (e.g., ammonia) 0-1 Coalescent or solvent 0-2 ColorAgent or pigment  0-25 Filler  0-70 Deairator 0-1 Thickener 0-3

One non-limiting clear coating formulation is as follows:

Weight Example A Raw Material % Range Weight % Water 20-40 29.4 High TgAcrylic (e.g., Dow's EI-6100 ™, etc.) 60-75 68.7 Anti-microbial AdditiveBlend 0.1-10  0.8 (e.g., Troysan 395 ™ and of either Polyphase 663 ™ orPolyphase 662 ™, etc.) pH Indicator 0-1 0.2 Dispersant or sufactant(e.g., Air Product's 0.1-1  0.6 Carbowet 109 ™ or Dow's Triton CF-10 ™,etc.) Defoamer (e.g., DEEFO PI-35 ™ or the like 0.05-0.8  0.4 from UltraAdditives, Tego Airex 902W ™ from Evonik) pH adjuster (e.g., ammonia,etc.)  0-0.5 0.2 Coalescent or solvent (e.g., Texanol ™, etc.) 0.1-1 0.7

Another non-limiting clear coating formulation is as follows:

Weight Example B Raw Material % Range Weight % Water  20-40 28.7%Acrylic Latex (e.g., Rhoplex EI-6000 ™, etc.)  60-75 69.0% Surfactant(e.g., Carbowet 109 ™, etc.) 0.1-1  0.6% Siloxane Deairator (e.g.,Airase 8070 ™, etc.) 0.05-1  0.2% Coalescing Solvent (e.g., Texanol ™,etc.) 0.2-2  0.7% In-Can Bactricide (e.g., Troysan 395 ™, etc.) 0.05-1%0.2% Dry Film Anti-microbial/Antifungal Additive 0.05-4% 0.6% (e.g.,Bioban 200 ™, etc.)

One non-limiting non-clear coating formulation is as follows:

Example C Raw Material Weight % Weight % Water   10-25 13.7 AssociativeThickener 0.05-2 0.5 Anti-microbial Additive Blend 0.05-3 0.2-1  (e.g.,Troysan 395 ™ and Bioban 200 ™ or Rozone 2000 ™, etc.) pH Indicator  0.01-0.5 0.05-0.1 Dispersant or surfactant(Air Product's 0.05-1 0.4Carbowet 109 ™ or Dow's Triton CF-10 ™) Defoamers (DEEFO PI-35 ™ or thelike from   0.05-0.8 0.3 Ultra Additives, Tego Airex 902W ™ from Evonik)pH adjuster (e.g., ammonia, etc.)   0.01-0.5 0.1 Coalescent or solvent(Texanol ™) 0.05-1 0.7 Titanium Dioxide    1-15 6.3 Acrylic Latex  20-55 42 Filler    5-60 34

One non-limiting method for applying a coating material (e.g., clearcoating, non-clear coating) to a roofing and/or siding material thatinhibits or prevents microbial growth on the roofing and/or sidingmaterial comprising the steps of:

a. Cleaning the surface of the roofing and/or siding material which isinstalled on a building structure, wherein the washing process canoptionally including a power washing process with a detergent (e.g.,Simple Green®), diluted bleach solution, etc., and then optionally arinsing cleaning;

b. Optionally applying one or more coatings of a bio-resistant base coatcomposition to the roofing and/or siding material (e.g., spray coating,brush coating, etc.);

c. Applying one or more coatings of a bio-resistant clear or non-clearcoating (e.g., spray coating, brush coating, etc.) that would retain itsanti-microbial properties for a period of 3-36 months and typicallyabout 12-24 months; and,

d. Optionally applying a new a coating of a bio-resistant clear ornon-clear coating after a certain period of time has passed (e.g. 3-36months) since applying a previous coating of a bio-resistant clear ornon-clear coating so as to maintain the efficacy of the coating on theroofing and/or siding material.

The effectiveness of the coating composition to inhibit or preventbacterial and fungal growth on a treated rood surface is set forthbelow. Two formulations of the coated were tested. The two formulationsare set forth as follows:

Example 1 Example 2 Raw Material Example of Raw Material wt % wt % Water29.2% 28.8% Acrylic Latex Rhoplex EI-6000 ™ 68.4% 67.4% SurfactantCarbowet 109 ™ 0.6% 0.6% Siloxane Deairator Airase 8070 ™ 0.2% 0.2%Coalescing Solvent Texanol ™ 0.7% 0.7% Defoamer DEEFO PI-35 ™ 0.1% 0.1%Bactricide Troysan 395 ™ 0.2% 0.2% Dry Film Anti- Polyphase 662 ™ 0.6%2.0% microbial/ Antifungal Additive

The non-limiting test procedure, which test results are illustrated inFIGS. 1 and 2, is described as follows:

Two sets of 3″×6″ panels that included two types of typical (butnon-limiting) roof surfaces were used in the experiment, namely amodified bitumen mineral-based cap sheet and a flood coat and graveled(FC/G) system consisting. Each panel included about 6-8 gal/100 ft² ofasphalt or modified asphalt over a non-mineral (or “smooth”) base sheet.Immediately after applying the hot asphalt or modified asphalt to thebase sheet, aggregate in the form of pea gravel or river rock wasdropped onto the still-molten asphalt surface. Five specimens of eachrepresentative surface type were left untreated (marked “Control”), twoadditional sets of five specimens from each surface type were coated onboth sides with the coating formulations of Example 1 and Example 2. Thepanels were randomly arranged on stackable trays, which were then placedinto a large bin containing enough water to be within approximately ⅛″from the bottom of the bottom tray. To encourage growth, an inoculasolution was produced using several fungi and bacteria isolated fromsubmitted actual roof specimens. The bin was sealed (not airtight) witha lid and placed under lamps that maintained the bin's daily interiortemperature at between 95-100° F. Specimens were also sprayed with asolution of potato water and sugar to encourage fungal growth as well asa solution of salt-free chicken broth to encourage bacterial growth.

Small cuts (approx. 1″×1″) were taken from each specimen at monthlyintervals beginning at one month and continuing to six months. Testingof these specimens consisted of standard dilution of each followed by“spread plating” on a tryticase soy agar (TSA) to enumerate bacteria anda sabouraud dextrose agar (SDA) to enumerate fungal and mildew growth.The TSA was allowed to incubate 1-3 days at 86-95° F., and the SDA wasallowed to incubate 2-5 days at 68-77° F. FIGS. 1 and 2 illustrate theaverages of colony forming units (CFU) per gram of sample tested.

Referring to FIG. 1, there is a 20-30% reduction in bacteria coloniesover mineral cap sheet and a more pronounced 57-87% reduction inbacterial colonies over flood coat and the gravel system when treatedwith the coating compositions of Examples 1 and 2. As illustrated inFIG. 2, there is an 80-97% reduction in fungal colonies formed overmineral cap sheet and a 55-99% reduction in fungal colonies over floodcoat and gravel sheets treated with the coating compositions of Examples1 and 2. FIGS. 1 and 2 graphically illustrate that the coatingcompositions of Examples 1 and 2 significantly reduce the growth ofbacteria and fungi on roof systems as compared to a non-treated roofsystem.

It will thus be seen that the objects set forth above, among those madeapparent from the preceding description, are efficiently attained, andsince certain changes may be made in the constructions set forth withoutdeparting from the spirit and scope of the invention, it is intendedthat all matter contained in the above description and shown in theaccompanying drawings shall be interpreted as illustrative and not in alimiting sense. The invention has been described with reference topreferred and alternate embodiments. Modifications and alterations willbecome apparent to those skilled in the art upon reading andunderstanding the detailed discussion of the invention provided herein.This invention is intended to include all such modifications andalterations insofar as they come within the scope of the presentinvention. It is also to be understood that the following claims areintended to cover all of the generic and specific features of theinvention herein described and all statements of the scope of theinvention, which, as a matter of language, might be said to falltherebetween.

We claim:
 1. A coating material that inhibits the growth of microbialson a surface of said coating material, said coating material includeswater, a base coat composition, an anti-microbial additive and one ormore additives selected from the group consisting of acrylic resin, pHindicator, surfactant, deairator, solvent, defoamer, thickener, filler,pH adjuster, and pigment, said base coat composition includes a resinmaterial, said coating material includes by weight percent: Water 20-40Acrylic resin 60-75 Anti-microbial additive 0.1-10  Defoamer 0.05-0.8 pH adjuster   0-0.5 pH indicator 0-1 Solvent 0.05-2   Surfactant0.05-1. 


2. The coating material as defined in claim 1, wherein saidanti-microbial additive includes two different anti-microbial compounds.3. The coating material as defined in claim 1, wherein said coatingmaterial includes by weight percent: Water 28-30 Acrylic resin 65-70Anti-microbial additive 0.4-1.5 Defoamer 0.2-0.6 pH adjuster   0-0.3 pHindicator   0-0.3 Solvent 0.5-0.9 Surfactant  0.5-0.9.


4. The coating material as defined in claim 2, wherein said coatingmaterial includes by weight percent: Water 28-30 Acrylic resin 65-70Anti-microbial additive 0.4-1.5 Defoamer 0.2-0.6 pH adjuster   0-0.3 pHindicator   0-0.3 Solvent 0.5-0.9 Surfactant  0.5-0.9.


5. The coating material as defined in claim 1, wherein saidanti-microbial additive is 0.1-6 wt %, said solvent is 0.2-2 wt. %, saidcoating material further including 0.05-1 wt. % deairator.
 6. Thecoating material as defined in claim 2, wherein said anti-microbialadditive is 0.1-6 wt %, said solvent is 0.2-2 wt. %, said coatingmaterial further including 0.05-1 wt. % deairator.
 7. The coatingmaterial as defined in claim 1, wherein said water is 25-30 wt. %, saidacrylic resin is 66-72 wt. %, said anti-microbial additive is 0.4-1.2wt. %, said solvent is 0.5-1 wt. %, said surfactant is 0.4-0.8 wt. %,said coating material further includes 0.1-0.3 wt. % deairator.
 8. Thecoating material as defined in claim 2, wherein said water is 25-30 wt.%, said acrylic resin is 66-72 wt. %, said anti-microbial additive is0.4-1.2 wt. %, said solvent is 0.5-1 wt. %, said surfactant is 0.4-0.8wt. %, said coating material further includes 0.1-0.3 wt. % deairator.9. The coating material as defined in claim 1, wherein said filler is5-60 wt. %, said pH adjuster is 0.01-0.5 wt. %, said pH indicator is0.01-0.5 wt. % said pigment is 1-15 wt. %, said solvent is 0.05-1 wt. %,and said thickener is 0.05-2 wt. %.
 10. The coating material as definedin claim 2, wherein said filler is 5-60 wt. %, said pH adjuster is0.01-0.5 wt. %, said pH indicator is 0.01-0.5 wt. %, said pigment is1-15 wt. %, said solvent is 0.05-1 wt. %, and said thickener is 0.05-2wt. %.
 11. The coating material as defined in claim 1, wherein saidanti-microbial additive is 0.2-1 wt. %, said filler is 20-40 wt. %, saidpH adjuster is 0.01-0.5 wt. %, said pH indicator is 0.05-0.1 wt. %, saidpigment is 4-10 wt. %, said solvent is 0.4-0.9 wt. %, said surfactant is0.2-0.6 wt. %, and said thickener is 0.2-0.8 wt. %.
 12. The coatingmaterial as defined in claim 2, wherein said anti-microbial additive is0.2-1 wt. %, said filler is 20-40 wt. %, said pH adjuster is 0.01-0.5wt. %, said pH indicator is 0.05-0.1 wt. %, said pigment is 4-10 wt. %,said solvent is 0.4-0.9 wt. %, said surfactant is 0.2-0.6 wt. %, andsaid thickener is 0.2-0.8 wt. %.
 13. The coating material as defined inclaim 1, wherein said anti-microbial additive is 0.4-2.5 wt. %, saiddefoamer is 0.05-0.4 wt. %, said solvent is 0.4-0.9 wt. %, saidsurfactant is 0.2-0.8 wt. %, said coating further including 0.1-0.5 wt.% deairator.
 14. The coating material as defined in claim 2, whereinsaid anti-microbial additive is 0.4-2.5 wt. %, said defoamer is 0.05-0.4wt. %, said solvent is 0.4-0.9 wt. %, said surfactant is 0.2-0.8 wt. %,said coating further including 0.1-0.5 wt. % deairator.
 15. The coatingmaterial as defined in claim 1, wherein said resin includes awater-based acrylic resin with a glass transition temperature of about0° F. to 90° F.
 16. The coating material as defined in claim 1, whereinsaid anti-microbial additive includes one or more materials selectedfrom the group consisting of4,5-dichloro-2-n-octyl-4-isothiazolin-3-one; sodium copperethylenediaminetetraacetate; methyl 2-benzimidazolecarbamate (BCM);3-iodo-2-propynyl butyl carbamate (IPBC); 3-(3,4-dichlorophenyl)-1,1-dimethylurea; 1,3-dihydroxymethyl-5,5-dimethylhydantoin;1-hydroxymethyl-5,5-dimethylhydantoin;cyclopropyl-N′-(1,1-dimethylethyl)-6-(methylthio)-1,3,5-triazine-2,4-diamine;octylisothiazolone; and quaternary ammonium compound.
 17. The coatingmaterial as defined in claim 1, wherein said surfactant is 0.05-1 wt. %,said surfactant including one or more compounds selected from the groupconsisting of ethoxylated nonionic surfactant; benzyl-polyethyleneglycol (1,1,3,3-tetramethylbutylphenyl) ether, and benzyl-polyethyleneglycol tert-octylphenyl ether.